Small collection of Polly.Net extensions

• Polly.Extensions
• Polly.Extensions.Distributed
  • Distributed bulkhead
    • Usage
    • Bulkhead key

Contains distributed implementations of Polly.Net policies.

The DistributedBulkheadPolicy can be used to create bulkhead policy with shared state. These can come in handy if you need to limit the concurrent access to a resource accross application instances. For example if you are limited to the concurrent access of a downstream services.

To create a distributed bulkhead you can use the normal Polly context to create a Policy and add the distributed bulkhead;

IConnectionMultiplexer multiplexer = ConnectionMultiplexer.Connect("localhost");
IDistributedBulkheadBackplan backplane = new RedisDistrubutedBulkheadBackplane(multiplexer);

var policy = Policy
                .Handle<Expection>()
                .DistributedBulkhead(backplane, "example", 3);

In the code sample above we create a Policy that handles all expections. The distributed bulkhead is limited to 3 concurrent excecutions and has the bulkhead key example. Redis is being used for the shared state.

To make use of more than one distributed bulkhead you have to specify the bulkhead key during the creation of the policy. This bulkhead key is the unique identifier of this bulkhead and is persistent across application restarts.